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The 'harder when brighter' X-ray behaviour of the low-lumin..:

Emmanoulopoulos, D. ; Papadakis, I. E. ; McHardy, I. M....
Monthly Notices of the Royal Astronomical Society.  424 (2012)  2 - p. 1327-1334 , 2012
Link: https://doi.org/10.1111/j.1365-2966.2012.21316.x